(01-23) 13:57 PST SAN FRANCISCO -- San Francisco police closed streets near AT&T Park for three hours Wednesday while bomb technicians investigated an object found by a construction crew, authorities said.

The crew stumbled onto the unidentified object on the 100 block of Terry Francois Street shortly before 9 a.m., said Officer Albie Esparza, a police spokesman.

Police originally said they thought they were dealing with a military explosive. But by noon, officers determined that the object was not dangerous and left.